Improvement in steam-boilers



UNITED STATES 'r QFFIGE.

JoHN HUGHES, on NEW YORK, N.

IMPROVEMENT IN STEAM-BOILERS.

Specification forming part of Letters Patent No. 193,253, dated July 17,1877 application filed June 15, 1877.

To all whom it may concern:

Be it known that I, JoHN HUGHES, of the city, county, and State of NewYork, have invented a new and useful Improvement in Steam-Boilers, whichimprovement is fully set forth in the following specification, referencebeing had to the accompanying drawings, in which- Figure 1 represents atransverse vertical section. Fig. 2 is a longitudinal vertical sec tionin the plane 00 m, Fig. 1. Fig. 3 is a horizontal section in the plane y3 Fig. l.

Similar letters indicate corresponding parts.

For many purposes horizontal boilers of cylindrical form, or of a formapproximating thereto, are preferable, but are objectionable in someinstances on account of their horizontal flues; and the object of myinvention is to provide an approximately cylindrical boiler withvertical flues, thus combining the advantages of a vertical andhorizontal cylindrical boiler.

To this end my invention consists in the combination, with the shell ofthe boiler, of p a tube-sheet on the top, and a series of vertical tubesextending from the crown of the firebox to said tube-sheet.

In the drawing, the letter A designates the fire-box of my steam-boiler.In the bottom part of this fire-box is situated the grate B, to whichaccess is had through the fire-door O. In the convex top of saidfire-box is a square, round, or oblong opening, a, over which extends atube-sheet, b, which is secured to the convex top of the fire-box byrivets c.

D is the shell of my boiler, the top of which is made cylindrical, whileits sides and ends extend down over the fire-box, and are connected tothe same by stay-bolts d. In the top of said shell is an opening, e,correspond ing in shape and size to the opening a in the top of thefire-box, and over this opening extends a tube-sheet, j, which isfastened to the convex top of the shell by rivets g. In the tube-sheetsb and f are secured a series of vertical fire-flues, E, and over theupper tubesheet f is placed the smoke-stack F.

It will be seen from this description that the firebox, as well as thefire-flues, are surrounded by water, and consequently a very tops of thefire-box and of the shell are strengthened, and my boiler is enabled tosustain a considerable pressure.

What 1 claim as new, and desire to secure by Letters Patent, is-

The combination, with the shell of a cylindrical boiler, of thetube-sheet secured to said shell, and a series of vertical tubesextending from the crown of thefire-box to said tubesheet, substantiallyas set forth.

In testimony that I claim the foregoing I have hereunto set my hand andseal this 12th day of J une, A. D. 1877.

JoHN HUGHES. [L. 8.].

Witnesses W. HAUFF, CHAS. WAHLERS.

